How come there are not more caliber choices in rimfire? Can they make a rimfire bullet for deer hunting?
Can they? Yes. There was once a time when they existed, especially in the 19th century. But it turns out that center fire is considerably superior in the role. Center fire was determined to have more reliable ignition (and still does today). A dud or 2 per 100 rimfire rounds is pretty much par for the course unless you are talking about premium fare, but that many would be completely unacceptable in the center fire realm. Center fire designs are able to be pushed to considerably higher pressures. After all, the brass has to be comparatively thin all around the rim in order for the priming compound to be able ignited via impact. And center fire cases are able to be reloaded -- easily if they are Boxer primed, much less so if Berdan primed.
In general, rimfires today are relegated to roles where low cost and/or low pressure are what are desired and reloading capability and extreme reliability aren't issues. That pretty much counts them out for higher pressure hunting (other than small game and short range varmints), longer range target, and combat roles.
If you have a concealed carry and someone starts shooting people randomly, what do you do? If his back is to you do you tell him to stop, or do you yell or just take aim and shoot him in the back? Is this possible scenario discussed in CCW classes?
IANAL. I understand that you better know the laws of the jurisdiction. I know that in some, like in Ga, the law says that you can use deadly force to intervene in the commission of a felony, which means that you can apply deadly force in the situation you describe. The situation is similar here in Tx, where the law was patterned after what happened in
the infamous Luby's massacre and Suzanna Gratia-Hupps's experience there and subsequent activism regarding CCW in Tx. But that isn't to say that is the situation everywhere.